The collector supply voltage is 6 V and the voltage drop across a resistor of 600 Ω . in the collector circuit is 0.6 V, in a transistor connected in common emitter mode. If the current gain is 20, the base current is

Question

The collector supply voltage is 6 V and the voltage drop across a resistor of 600 Ω . in the collector circuit is 0.6 V, in a transistor connected in common emitter mode. If the current gain is 20, the base current is (A) 0.25 mA (B) 0.05 mA (C) 0.12 mA (D) 0.02 mA

Tardigrade Admin · Accepted Answer

iCRC=VC iC=(VC/RC)=(0.6/600)=1 mA ∴ β =(iC/iB) or iB=(iC/β )=(1/20)=0.05 mA

Q. The collector supply voltage is $6 V$ and the voltage drop across a resistor of $600 Ω$ . in the collector circuit is $0.6 V$ , in a transistor connected in common emitter mode. If the current gain is $20$ , the base current is

$0.25 m A$

$0.05 m A$

$0.12 m A$

$0.02 m A$

$0.07 m A$

$i_{C} R_{C} = V_{C}$
$i_{C} = \frac{V _{C}}{R _{C}} = \frac{0.6}{600} = 1 m A$
$∴$ $β = \frac{i _{C}}{i _{B}}$
or $i_{B} = \frac{i _{C}}{β} = \frac{1}{20} = 0.05 m A$

Q. The collector supply voltage is 6V and the voltage drop across a resistor of 600Ω . in the collector circuit is 0.6V, in a transistor connected in common emitter mode. If the current gain is 20, the base current is

0.25mA

0.05mA

0.12mA

0.02mA

0.07mA

iC​RC​=VC​ iC​=RC​VC​​=6000.6​=1mA ∴ β=iB​iC​​ or iB​=βiC​​=201​=0.05mA